What is GrainPro in green coffee storage?

GrainPro is a brand of hermetically sealed polyethylene bag liner that sits inside a standard jute or sisal export sack and creates an oxygen and moisture barrier around the green coffee. The name has become generic in the trade - used for any hermetic liner regardless of manufacturer, much like Hoover or Biro.

Without a hermetic liner, green coffee sits in direct contact with the ambient environment - absorbing humidity, losing moisture in dry conditions, and picking up any odours present in nearby storage. Over time this degrades freshness and cup quality noticeably. GrainPro slows that process significantly, which is why it's standard for specialty lots shipping over long distances or held in storage for extended periods.

When you're looking at green coffee offers, the presence of hermetic packaging is a positive signal - it suggests the exporter or importer is paying attention to preservation, not just getting the bags on a boat.